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How long does it take for antibiotics to work

A 29-year-old male asked:
Dr. Martin Morell
28 years experience Rheumatology
Lyme: Elisa test to determine if you're infected, if +, a Western Blot to confirm. I don't think Lyme endemic in Chile.
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A 38-year-old member asked:
Dr. Michael Ein
47 years experience Infectious Disease
See below: The primary treatment of an abscess is drainage. Antibiotics can effect improvement in the surrounding soft tissue infection in 2-4 days but drainage ... Read More
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A 43-year-old member asked:
Dr. Mary Ann Block
31 years experience General Practice
Depends: It is important to finish the antibiotic once it is started.
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A 45-year-old member asked:
Dr. Quresh Khairullah
41 years experience Nephrology and Dialysis
See below: If they are effective and choosen correctly around 24-48 hours depending on whether it is a bladder or kidney infection.
A 40-year-old member asked:
Dr. Tsu-Yi Chuang
49 years experience Dermatology
Depends: You just have to try it and see. I usually see how it goes for 3 months before i switch to others.
A 26-year-old male asked:
Dr. Michael Zacharisen
32 years experience Allergy and Immunology
1 to 3 hours: Claritin d is a combination antihistamine [claritin= loratadine] and d= decongestant pseudoephedrine. This product is rapidly absorbed then metaboliz ... Read More
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A 22-year-old female asked:
Dr. Ellen Altenburg
30 years experience Pediatrics
A week: You have to give it at least a week. Keeps the new lesions for occurring, doesn't treat the lesions that are already there as well.
A member asked:
Dr. Ziad Akl
Dr. Ziad Akl answered
30 years experience Infectious Disease
Quickly: It takes just a few hours to kill the bacteria but the symptoms may lag behind.
A 47-year-old member asked:
Dr. Anatoly Belilovsky
34 years experience Pediatrics
Depends.: Half-life of penicillin is a couple of hours; that of Azithromycin - several days. Other meds are in between.
A 42-year-old member asked:
Dr. Jeff Finkelstein
Specializes in Emergency Medicine
It depends: What is being treated, is it the right drug, are the bugs resistent, the health of the patient and other factors. No short answer.
A 55-year-old member asked:
Dr. Al Hegab
Dr. Al Hegab answered
39 years experience Allergy and Immunology
Depends: in acute upper respiratory tract inflammation, might work right away, but in chronic conditions would take about 2-3 days to work, given that it is ta ... Read More
A 48-year-old member asked:
Dr. Ahmad M Hadied
48 years experience Orthopedic Surgery
24-72 hours: After 2 to 3 days if is not call your doctor.
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A 48-year-old member asked:
Dr. Al Hegab
Dr. Al Hegab answered
39 years experience Allergy and Immunology
Depends: if taken on empty stomach, 30 minutes should be enough to feel its effect, if on a full stomach takes longer, check that you have taken the right dose ... Read More
A 48-year-old member asked:
Dr. Martin Raff
55 years experience Infectious Disease
Mebendazole: What are you treating?
A 48-year-old member asked:
Dr. Archibald Miller
40 years experience Plastic Surgery
Gastritis: This medication should start having an effect within 2 hours of oral intake.
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4 thanks
A 48-year-old member asked:
Dr. Clarence Grim
56 years experience Endocrinology
Sulfa meds: They start killing germs within minutes. But this depends on the germs being treated.
A 39-year-old member asked:
Dr. Wayne Ingram
Specializes in Obstetrics and Gynecology
Length of Rx: It depends on the length of the antibiotic rx that is given and whether it is completed properly. Most rx's take one to two weeks of rx.
A 55-year-old member asked:
Dr. George Yang
26 years experience Ophthalmology
Another question?: Naphcon a shrinks blood vessels and makes the eye appear less red. However, the more important question is why your eye is red to begin with. Redness ... Read More
A 39-year-old member asked:
Dr. Yash Khanna
56 years experience Family Medicine
Depends on how long: Duration of cure depends on how long the person has had the infection.If the infection has not spread to the cervix or the urethra it will clear in tw ... Read More
A 56-year-old member asked:
Dr. William Lizarraga
15 years experience Internal Medicine
Hours to days: The antibiotic should begin to work - that is, kill bacteria - within hours. By a day or so, symptoms should be improving. Depending on how complicate ... Read More
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A 29-year-old female asked:
Dr. John Munshower
29 years experience Family Medicine
Same day: You should be able to hopefully notice some results withing the same day you take it.
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A 48-year-old member asked:
Dr. Michael Ein
47 years experience Infectious Disease
Depends on half life: Various antibiotics have different half lives. A half life is the time it takes to excrete 1/2 of the drug present in the body. A drug is considered ... Read More

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

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